Wireless Telegraphy and Hertzian Waves

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Whittaker & Company, 1910 - Electric waves - 136 pages

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Page 15 - ... a single spark from the prime conductor of the machine, of about an inch long, thrown on the end of a circuit of wire in an upper room, produced an induction sufficiently powerful to magnetize needles in a parallel circuit of wire placed in the cellar beneath, at a perpendicular distance of thirty feet with two floors and ceilings, each fourteen inches thick, intervening.
Page 138 - HASKINS, CH The Galvanometer and its Uses. A Manual for Electricians and Students.
Page 40 - When working with the radiating sphere, Fig. 19, at a distance of forty yards out of window, I could not for this reason shout to my assistant, to cause him to press the key of the coil and make a spark, but I showed him a duster instead, this being a silent signal which had no disturbing effect on the coherer or tube of filings. I mention...
Page 31 - Moreover, he proved that these surging waves were capable of setting up similar waves in bodies in their vicinity, provided these bodies were of such electrical capacity as to be able to vibrate electrically, at the same rate as the body which emitted them. This...
Page 138 - I. d. GRIFFITHS, AB Treatise on Manures . . .76 GUTTMANN, O. Manufacture of Explosives. 2 Vols. . 42 0 „ Twenty Years' Progress in the Manufacture of Explosives . . net 3 0 HARRIS, W. Practical Chemistry. Vol. I. Measurement 1 0 Vol.. II. Exercises and Problems . .16 Vol. III. Analysis . . . .16 HATCH, FH Mineralogy, The Characters of Minerals, their Classification and Description . . .26 HAWKINS, CC, and WALLIS, F.
Page 14 - ... the fact that a single spark of about an inch in length from the prime conductor of a machine passing to the end of a circuit of wire placed in an upper room produced an induction sufficiently powerful to...
Page 29 - As in the case of sound, in order that these waves may become evident to our senses, they must be received by something which is capable of taking up the same rate of vibration, or, as we should say in the case of sound, " in tune
Page 36 - ... take up a symmetrical position, the individual particles arranging themselves in lines transversely to the direction of the flow of the current. This effect may be likened to the result produced on a company of soldiers standing " at ease " when the officer gives the command,

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